Oil pump



Feb. 23, 1932. T, B. BENNETT OIL PUMP Filed Feb. 28, 1928 In oenTor Thomas eame Eg-fw?, Mq

Patented Feb. 23, 1932 UNITED STATES 'PATENT orrlcs.

THOMAS B. BENNETT, OF MUSKEGON, MICHIGAN, ASSIGNOR T BENNETT PUMIlS COR- PORATION, 0F MUSKEGON, MICHIGAN, A CORPORATION 0F MICI'HGAN OIL PUMP Application filed February 28, 1928. Serial No. 257,580.

- at the upper end ofthe pump and with drainage for oil which might pass by the piston directly back into the tank or receptacle from which it is pumped. The invention which I have made is directed to the accomplishment of these ends in a simple and practical manner, as will be fully understood from the following description taken in connection with the accompanying drawings, in which,

Fig. 1 is a vertical section through the i 1 pump made in accordance with my invention,

and

F ig. 2 is a fragmentary vertical section on a plane at right angles to the plane of the section shown in Fig. 1 and illustrating the method of operating the pump piston.

Like reference characters refer to like parts in the figures of the drawings.

Oil or like liquid is usually contained in a tank or other container 1 above which a pump may be placed. The pump of my invention comprises a base 2 adapted to rest against. the upper side of the tank from which a pedestal 3 extends upwardly, which has two passages 4 and 5 vertically therein completely separated from each other. A short nipple 6 is threaded through the base 2 at the lower end of the passage and extends into the tank 1. An inlet pipe 7 has a threaded connection through the base 2 to communi-- cate with the lower end of the other passage 4 und extends downwardly into the tank 1, having a valve cage 8 at its lower end carrying a check valve 9 past which the oil passes from the tank to the pump, first passing through a screen, as shown in Fig. 1.

At the upper end of the pedestal 3 and above the passage 5, two journals 10 are cast integrally with the pedestal at opposite sides thereof in which a pinion shaft 11 f i is rotatably mounted. The shaft extends through one of the journals to the outside and is equipped with a crank 12 whereby it may be readily rotated. Inasmuch as there is no pressure of oil ever exerted in the passage 5 or around the pinion shaft 11, no packing is required where said shaft extends through one of the ournals 10 and the closing washer 13 shown may be used merely for purposes of appearance. l i

A pump cylinder '14 lies above the upper end of the pedestal having an open lowerend which communicates with the passage described. The cylinder is secured in any desired manner to the upper end of the pedestal. As shown 'it has closed upper end with an outlet at one side, indicated at 15, in which a short tube 16 is threaded, at its outer end being equipped with a delivery nozzle 17 which has a check valve permitting outward flow ofthe oil but closing to prohibit entrance of air. At the opposite side of the upper end of the cylinder 14 is a hollow arm 18`having anopeningin its lower side in vertical alignment with the upper end of the passage 4. A tube 19 is threaded at its upper end into the opening in the arm 18 and at its lower end is received 4in the upper end of the pedestal 3 aligned with the upper end of the passage 4, and being secured against leakage of oil by any suitable packing indicated at 20.

A piston rod 21 formed with rack teeth at one side is mounted for vertical reciprocatory movements in the cylinder 14. At itslower end it passes by and engages with the pinion 11, being held thereagainst by a suitable guide flange 22, as best shown in Fig. 1. The upper end of the rod 21 is reduced in diameter, making an extension 23, on which the two halves 24 of the piston are mounted, clamping between them suitable cup leathers 25 which are positioned in opposition to each other and are held outwardly against the inner walls of the cylinder by means of the usual springs. The two halves of the piston 24 and the cup' leathers are clamped together by threading a nut onto the upper end of the part 23, forcing the lower halt' 24 of the piston against the shoulder made between the rack rod 21 and its reduced extension 23. In the upper end or head of the cylinder 14, an adjustable stop screw 26 is mounted against the lower end of which the upper end of part 23 engages to limit the upward movement of the piston.

The piston may be reciprocated in the cylinder by turning the crank 12 in opposite directions. On the down stroke of the pis ton oil is drawn past the valve 9 through the intake pipe 7 and the passage 4 and thence through the connecting pipe 19 into the cylinder above the piston. The check valve in the nozzle 17 closes so that air will not be drawn into the cylinder. On reversing the `movement of the piston the check valve 9 closes and the oil is forced outwardly through the outlet pipe 16 and past the check valve in the nozzle 17 and is delivered from the nozzle.

It is evident that with this construction a valveless piston is provided, and should there be any passage of oil downwardly by the piston when the same is moved upwardly to force the oil out at the nozzle, it will flow downwardly thru the cylinder and into the passage 5 and return to the tank through the nipple 6.

This construction is very lpractical and serviceable. There are numerous variations in minor detail of structure which may be resorted to without in any way departing from the invention. For instance, as is common in oil pumps, the cylinder 14 and its head may be made of two parts and the cylinder bound between the upper and lower heads therefor by means of connecting tie rods.

This is old and well known and is not concerned in any way with the invention which I have made. The invention is defined in the appendedv claim and is to be considered comprehensive of all forms of structure coming within its scope.

I claim:

A pump comprising, a verticalpedestal support having a first passage and a second passage therein, a drain nipple connected to said support at the lower end thereof and joined with the first passage, an inlet pipe connected to said support and joining with the lower end of the second passage, a vertical cylinder mounted upon and secured to the upper end of said support over said rst pas sage and communicating therewith, vsaid cylinder having a closed upper end and an outlet at one side thereof, a conduit connecting with the upper end of said-pedestal support, in conjunction with the second passage 1 therethrough and also connected to the upper end of said cylinder, a piston in said cylinder mounted for vertical reciprocation, and means for manually. reciprocating said piston.

In testimony whereof I affix my signature.

THOMAS B. BENNETT. 

